Year	% net
1996	83.76757
1997	83.66929
1998	83.12945
1999	83.49732
2000	84.72794
2001	85.95791
2002	86.40111
2003	86.71729
2004	85.97552
2005	85.98501
2006	86.26724
2007	86.46579
2008	86.73677
2009	86.63243
2010	87.86743
2011	88.30672
2012	88.28576
2013	89.42876
2014	89.87258
2015	90.14916
2016	89.83235
2017	90.23664
2018	89.98414